Hard Reset and Factory Reset Nokia Lumia 835

Before you try the factory reset or hard reset on your device, make sure that you have backup your important files. Restoring the default settings or factory reset your device will delete all your existing files and will go back to its initial state.

Factory Reset:

>>> Open Windows Phone Settings

>>> Tap "about"

>>> Tap "reset your phone"

Hard Reset:

>>> Turn off your phone

>>> Then press the Power-Button once

>>> Press and Hold the Volume-Down-Button until you see the exclamation point "!" on your screen